Is there a calculation that I can do that will calculate the required shutter speed if I know the speed of my subject and want to get a crisp image e.g. freeze motion? For example if I go to a car ...
How can I calculate the change an extension tube makes to the maximum magnification of a lens? [duplicate]
Possible Duplicate: How can I calculate what the effect of an extension tube will be? My understanding is that extension tubes increase the magnification of lenses by reducing their minimum ...